[I]t is true that ‘I seem to see a table’ does not entail ‘I see a table’; but ‘I seem to feel a pain’ does entail ‘I feel a pain’. So scepticism loses its force—cannot open up its characteristic gap—with regard to that which ultimately most concerns us, pleasure and pain.

Galen Strawson, Freedom and Belief, Oxford, 2010, p. 223